x=0.6x^2-3x-1.5

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Solution for x=0.6x^2-3x-1.5 equation:


Simplifying
x = 0.6x2 + -3x + -1.5

Reorder the terms:
x = -1.5 + -3x + 0.6x2

Solving
x = -1.5 + -3x + 0.6x2

Solving for variable 'x'.

Reorder the terms:
1.5 + x + 3x + -0.6x2 = -1.5 + -3x + 0.6x2 + 1.5 + 3x + -0.6x2

Combine like terms: x + 3x = 4x
1.5 + 4x + -0.6x2 = -1.5 + -3x + 0.6x2 + 1.5 + 3x + -0.6x2

Reorder the terms:
1.5 + 4x + -0.6x2 = -1.5 + 1.5 + -3x + 3x + 0.6x2 + -0.6x2

Combine like terms: -1.5 + 1.5 = 0.0
1.5 + 4x + -0.6x2 = 0.0 + -3x + 3x + 0.6x2 + -0.6x2
1.5 + 4x + -0.6x2 = -3x + 3x + 0.6x2 + -0.6x2

Combine like terms: -3x + 3x = 0
1.5 + 4x + -0.6x2 = 0 + 0.6x2 + -0.6x2
1.5 + 4x + -0.6x2 = 0.6x2 + -0.6x2

Combine like terms: 0.6x2 + -0.6x2 = 0.0
1.5 + 4x + -0.6x2 = 0.0

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
-2.5 + -6.666666667x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -6.666666667x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -6.666666667x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -6.666666667x + x2 = 0 + 2.5
-6.666666667x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-6.666666667x + x2 = 2.5

The x term is -6.666666667x.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667x + 11.11111112 + x2 = 2.5 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667x + x2 = 2.5 + 11.11111112

Combine like terms: 2.5 + 11.11111112 = 13.61111112
11.11111112 + -6.666666667x + x2 = 13.61111112

Factor a perfect square on the left side:
(x + -3.333333334)(x + -3.333333334) = 13.61111112

Calculate the square root of the right side: 3.689323938

Break this problem into two subproblems by setting 
(x + -3.333333334) equal to 3.689323938 and -3.689323938.

Subproblem 1

x + -3.333333334 = 3.689323938 Simplifying x + -3.333333334 = 3.689323938 Reorder the terms: -3.333333334 + x = 3.689323938 Solving -3.333333334 + x = 3.689323938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = 3.689323938 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = 3.689323938 + 3.333333334 x = 3.689323938 + 3.333333334 Combine like terms: 3.689323938 + 3.333333334 = 7.022657272 x = 7.022657272 Simplifying x = 7.022657272

Subproblem 2

x + -3.333333334 = -3.689323938 Simplifying x + -3.333333334 = -3.689323938 Reorder the terms: -3.333333334 + x = -3.689323938 Solving -3.333333334 + x = -3.689323938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = -3.689323938 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = -3.689323938 + 3.333333334 x = -3.689323938 + 3.333333334 Combine like terms: -3.689323938 + 3.333333334 = -0.355990604 x = -0.355990604 Simplifying x = -0.355990604

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.022657272, -0.355990604}

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